ASME B18.2.2-2010 [Revision of ASME/ANSI B18.2.2-1987 (R2005)] Nuts for General Applications: Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series) AN AMERICAN NATIONAL STANDARD --`,`,````,`,``,```,``,,``,,,,`,-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME Licensee=University of Texas Revised Sub Account/5620001114 No reproduction or networking permitted without license from IHS Not for Resale, 08/02/2013 23:26:23 MDT INTENTIONALLY LEFT BLANK Daneshkaran (Mobile Library) Tel:+9821-22967252 & 66433761 Fax:+9821-22957146 Mobile: 09126939613 www.Daneshkaran.ir --`,`,````,`,``,```,``,,``,,,,`,-`-`,,`,,`,`,,`--- Copyright ASME International Provided by IHS under license with ASME Licensee=University of Texas Revised Sub Account/5620001114 No reproduction or networking permitted without license from IHS Not for Resale, 08/02/2013 23:26:23 MDT ASME B18.2.2-2010 [Revision of ASME/ANSI B18.2.2-1987 (R2005)] Nuts for General Applications: Machine --`,`,````,`,``,```,``,,``,,,,`,-`-`,,`,,`,`,,`--- Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series) AN AMERICAN NATIONAL STANDARD Three Park Avenue • New York, NY • 10016 USA Copyright ASME International Provided by IHS under license with ASME Licensee=University of Texas Revised Sub Account/5620001114 No reproduction or networking permitted without license from IHS Not for Resale, 08/02/2013 23:26:23 MDT Date of Issuance: November 30, 2010 This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda issued to this edition. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME B18 Committee may be published as Cases. Cases and interpretations are published on the ASME Web site under the Committee Pages at --`,`,````,`,``,```,``,,``,,,,`,-`-`,,`,,`,`,,`--- http://cstools.asme.org as they are issued. ASME is the registered trademark of The American Society of Mechanical Engineers. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990 Copyright © 2010 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A. Daneshkaran (Mobile Library) Tel:+9821-22967252 & 66433761 Fax:+9821-22957146 Mobile: 09126939613 www.Daneshkaran.ir Copyright ASME International Provided by IHS under license with ASME Licensee=University of Texas Revised Sub Account/5620001114 No reproduction or networking permitted without license from IHS Not for Resale, 08/02/2013 23:26:23 MDT CONTENTS Foreword .............................................................................. iv Committee Roster ..................................................................... vi Correspondence With the B18 Committee .............................................. vii 1 Introduction ...................................................................... 1 2 References........................................................................ 1 --`,`,````,`,``,```,``,,``,,,,`,-`-`,,`,,`,`,,`--- 3 General Data...................................................................... 1 Tables 1-1 Dimensions of Square and Hex Machine Screw Nuts .............................. 4 1-2 Dimensions of Small Pattern Hex Machine Screw Nuts ........................... 5 2 Dimensions of Square Nuts ...................................................... 6 3 Dimensions of Hex Flat Nuts and Hex Flat Jam Nuts ............................. 7 4 Dimensions of Hex Nuts and Hex Jam Nuts ...................................... 8 5 Dimensions of Hex Slotted Nuts ................................................. 9 6 Dimensions of Hex Thick Nuts ................................................... 10 7 Dimensions of Hex Thick Slotted Nuts ........................................... 11 8 Dimensions of Heavy Square Nuts ............................................... 12 9 Dimensions of Heavy Hex Flat Nuts and Heavy Hex Flat Jam Nuts ............... 13 10 Dimensions of Heavy Hex Nuts and Heavy Hex Jam Nuts ........................ 14 11 Dimensions of Heavy Hex Slotted Nuts .......................................... 15 12 Dimensions of Hex Flange Nuts and Large Hex Flange Nuts ...................... 16 13 Dimensions of Hex Coupling Nuts ............................................... 17 Mandatory Appendix I Slot Gages and Gaging for Slotted Nuts .......................................... 19 Nonmandatory Appendices A Formulas for Nut Dimensions .................................................... 21 B Wrench Openings for Square and Hex Nuts ...................................... 24 iii Copyright ASME International Provided by IHS under license with ASME Licensee=University of Texas Revised Sub Account/5620001114 No reproduction or networking permitted without license from IHS Not for Resale, 08/02/2013 23:26:23 MDT FOREWORD American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as Sectional Committee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute, Inc.) with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 2 was subsequently established and charged with the responsibility for technical content of standards covering wrench head bolts and nuts. Subcommittee 2, after appraisal of the requirements of industry, developed a proposed standard series of bolt head and nut dimensions. This proposal was finally approved and designated a Tentative American Standard in February 1927. A first revision of the document was designated as an American Standard in March 1933 and was followed by a second revision that was granted approval as an American Standard in January 1941. Following reorganization of the B18 Committee in 1947, Subcommittee 2 was asked to expand the standard on head proportions into a complete product standard. A proposal covering square and hexagon head bolts and nuts, hexagon head cap screws, and automotive hexagon head bolts was prepared and submitted to the B18 Committee in April 1950. While this draft was under consideration, the B18 Committee received a proposal from the British Standards Institution for unification of dimensions on products incorporating unified screw threads. The Committee welcomed the opportunity of discussing the proposals and an American-British-Canadian Conference was held in New York on June 1 and 2, 1950. It was agreed in the conference that the essentials of unification could be accomplished by selection of mutually satisfactory across-the-flats dimensions, since this would permit the use of the same wrenches and because other features would rarely affect interchangeability. After due consideration, suitable existing across-the-flats dimensions were selected for the hexagon products affected. In its meeting of October 13, 1950, Subcommittee 2 agreed to incorporate into the proposed 1 5 standard the conference recommendations on ⁄4 in. hexagon head bolts, ⁄8 in. hexagon head cap 7 screws and automotive hexagon head bolts, and ⁄16 in. light and regular hexagon and square nuts. At a subsequent meeting of Subcommittee 2, further changes were adopted in order to combine the light and regular series of nuts, and to combine the automotive hexagon head bolt, hexagon head cap screw, and regular hexagon head close tolerance bolt. In view of the progress made in the United States and the urgency of standardization for mutual defense, the British Standards Institution sponsored a second conference in London in April 1951 to complete the unification of certain hexagon bolts and nuts. At a meeting on June 8, 1951, Subcommittee 2 reaffirmed its acceptance of the unified